друг друга

• IPA^(key): [druɡ ˈdruɡə]

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друг дру́га • (drug drúga)

1. one another, each other

   держа́ть друг дру́га за ру́ку ― deržátʹ drug drúga za rúku ― to hold hands

• The first друг is always in the nominative case, while the second declines as necessary.
• When used with a preposition, formally the preposition goes before the second друг (друг с (s) другом, “with each other, together”), but in colloquial speech the preposition often comes before the first друг (с друг другом).